< User:Milton BeychokRevision as of 17:20, 14 May 2009 by imported>Milton Beychok
Properties
Property |
Value
|
Common name |
tetra-ethyl lead
|
Other names |
tetraethyl lead, lead tetraethyl, tetraethyl plumbane
|
IUPAC name |
|
CAS number |
78-00-2
|
Molecular formula |
(CH3CH2)4Pb
|
Molecular mass |
323.4 g/mol[1]
|
Density |
1.653 g/ml for liquid at 20 °C, 1 atm
|
Boiling point |
455.7 K (182.6 °C) at 1 atm[1]
|
Melting point |
142.94 K (-130.2 °C)[1]
|
Specific heat, cp |
0.956 J/(g·K) for liquid at 20 °C[1]
|
Heat of vaporization |
175.0 J/g for liquid at 182.6 °C[1]
|
Heat of fusion |
27.2 J/g for solid at -130.2 °C[1]
|
Viscosity |
|
Refractive index |
|
|
|
Tetra-ethyl lead (TEL) is a viscous liquid with the chemical formula (CH3CH2)4Pb. Once widely used (circa 1925 to 1990) to increase the octane rating of gasoline (petrol), TEL usage in gasoline has been largely phased out by most nations[2]primarily because of the toxicity of the lead emissions from spark-ignited internal combustion engines burning gasoline containing TEL. Another reason for discontinuing TEL usage was that it degraded the efficiency of the catalytic converters installed in automotive vehicles to reduce their emissions of air pollutants.